Four o'clock

We saw this unusual wildflower at Confluence Park a couple of days ago. I had seen the leaves of a plant once before, but this was the very first time I had seen a flower. This wild Four-o’clock (Mirabilis nyctaginea) has five sepals, often joined at the base, that look like petals. Four o’clock is so named because of its habit of opening in the late afternoon. It is not actually the time of day that causes the flowers to open, but the drop in temperature.